-A Wisconsin judge quashed subpoenas and ordered the return of property to the targets of a secret campaign-finance investigation involving Gov. Scott Walker.

Judge Gregory A. Peterson ruled Friday some of those subpoenas were improper.

He's overseeing the so-called John Doe investigation into Walker's campaign and more than two dozen conservative groups.

Peterson wrote they "do not show probable cause that the moving parties committed any violations of the campaign finance laws."

A special prosecutor subpoenaed the campaign and groups in November seeking records and fundraising information related to recall attempts in 2011 and 2012 that targeted Walker and Republican state senators.